Foxy in these fanfictions is frequently portrayed with a sense of loyalty. He might be the type to stay by the Reader's side through various dangerous situations in the FNAF world. His broken - down appearance in some versions of the game also adds to the pathos in the fanfictions. Writers often play on his 'outcast' status among the other animatronics, which can make for some interesting relationship dynamics with the Reader.
One possible scenario could be that in the fanfic, Foxy runs away because he's scared of something in the pizzeria. Maybe he's afraid of the new security measures that are being put in place which he doesn't understand. As for the Foxy x Reader part, perhaps the reader is the only one who can understand Foxy's distress and tries to find him.
A fanfiction could explore the relationship between Foxy and Mangle in a more emotional way. Maybe Mangle has always been in awe of Foxy's courage and Foxy starts to see Mangle in a new light, leading to a deep friendship or something more. It could be set during a particularly difficult night in the pizzeria when they have to rely on each other more than ever.
Another aspect of fanfictions with these two could be centered around competition. Since they are both animatronics in the same pizzeria, they might compete for the attention of the children or for who gets to be the star of the show. This could lead to some humorous situations, like a dance - off or a race through the pizzeria to see who can reach a certain area first.
Once upon a time in the spooky world of FNAF, Foxy was known for his sudden and terrifying appearances. There was a night guard who heard strange creaking sounds coming from Pirate Cove. As he shone his flashlight towards it, he saw Foxy's glowing eyes in the darkness. Before he could react, Foxy dashed out at lightning speed, his sharp teeth bared. The guard barely escaped that night, haunted by the image of Foxy forever.
Bonnie from FNAF could be a great crossover character with Foxy. They already have a connection in the FNAF universe, and in a crossover, they could have new adventures together, perhaps in a different time or place.
Obviously, Foxy and the reader are the main characters. Foxy is the animatronic character with its own personality and backstory within the FNAF universe. And the reader is the character through whose perspective the story is often told.
In a 'FNAF Foxy Runaway Foxy x Reader Fanfic', the plot might involve the reader being in the wrong place at the right time. Foxy is on the run from the other animatronics or some other threat in the pizzeria. The reader and Foxy start to trust each other as they face various obstacles together. For example, they might have to avoid security guards or other animatronics that are out to get Foxy. As they spend more time together, a special relationship develops between them, which could be a friendship or something more romantic depending on how the author wants to write it.
The plot could involve Foxy running away because he feels a connection to the reader that he can't explain. He's afraid of how the other animatronics will react, so he runs. The reader, on the other hand, is determined to find Foxy. As they search, they face various challenges in the spooky pizzeria. It could also be that Foxy is trying to protect the reader from something in the pizzeria by running away, leading the reader to figure out what that is.
Even the kids who visit the pizzeria could be main characters. They might be the first to notice that Foxy is acting strange. One of the kids could be really attached to Foxy and be very worried about him. This kid could try to get the staff's attention to help Foxy or even try to comfort Foxy on their own.